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  1. It’s a boy! It’s a girl! It’s a mosaic embryo

    Using a new technique to examine chromosomes of in vitro fertilization (IVF) embryos at the time they're implanted in the womb, researchers report abnormalities never seen later in development, possibly explaining why IVF has a low efficiency.

    By Laura Sivitz
  2. Math

    Anatomy of a Bead Creature

    Beadwork offers a novel view of hyperbolic geometry.

    By Ivars Peterson
  3. Math

    Functions on Display

    To mathematicians, the term “function” has a specific meaning. It’s a rule that assigns a fixed output for a given input; in effect, a formula. Among the most familiar functions are the sine and cosine functions of trigonometry.